Recognition of similar shapes

Juan M. Simon; Rodolfo M. Echarri

doi:10.1117/12.437079

14 August 2001 Recognition of similar shapes

Juan M. Simon, Rodolfo M. Echarri

Proceedings Volume 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications; (2001) https://doi.org/10.1117/12.437079
Event: IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, 2001, Tandil, Argentina

Abstract

To recognize patterns, correlation and deconvolution techniques are frequently used. The deconvolution yields an identification signal with maximum discrimination and extreme sensibility for small fluctuations in intensity and shape. The phase only filter has the advantage of been more easy to implement in laboratory and it can yield a recognition signal even when object and filter are only slightly similar. The autocorrelation exhibits the latter behavior to a greater extent. In some cases what is of interest is not the equality but the similarity of shapes, e.g., when objects which appear in a fragmented way are to be recognized. In the present article a method to adjust the degree of acceptable similarity between filter and object is proposed and the object is recognized by means of a simple change in a coefficient appearing in the numerical processing.

Citation Download Citation

Juan M. Simon and Rodolfo M. Echarri "Recognition of similar shapes", Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); https://doi.org/10.1117/12.437079

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KEYWORDS

Deconvolution

Phase only filters

Transform theory

Electronic filtering

Fourier transforms

Laser optics

Optical pattern recognition

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